Asphalt Composition Using Cross-Linked LCDR for Low-Temperature Performance
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Solution Overview
Problem
Modified asphalts face issues with low-temperature properties, post-aging properties, storage stability, and workability due to increased volatility and viscosity when using polymer modifying agents, leading to cracking and degraded storage stability.
Innovation Solution
An asphalt composition combining a vinyl aromatic hydrocarbon-conjugated diene block copolymer with a low-molecular weight conjugated diene rubber (LCDR), where the LCDR is cross-linked by sulfur to enhance dispersion and stability, improving low-temperature properties and workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the content of modifying agent or the molecular weight of polymer is increased to improve physical properties, then low-temperature properties are improved, but storage stability degrades
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight of the conjugated diene polymer (70,000-500,000 g/mol) and the sulfur content (0.01-5 parts by weight per 100 parts of polymer). This optimization resolves the contradiction by finding the precise parameter range where low-temperature properties are improved while storage stability is maintained, avoiding the degradation that occurs with higher polymer molecular weights or sulfur contents.
Solution Approach 2:
The patent uses composite materials by combining vinyl aromatic hydrocarbon-conjugated diene block copolymer with low-molecular weight conjugated diene rubber and sulfur. This composite approach allows the system to achieve improved low-temperature properties through the polymer modification while the specific molecular weight control and sulfur cross-linking prevent storage stability degradation, effectively resolving the contradiction between temperature performance and storage stability.
2Temperature
If the content of modifying agent is increased to improve physical properties, then low-temperature properties are improved, but the modified asphalt becomes more volatile causing cracking
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight of the conjugated diene polymer to be within 70,000-500,000 g/mol and controlling sulfur content at 0.01-5 parts by weight per 100 parts of polymer. This precise parameter control reduces volatility and prevents cracking while maintaining improved low-temperature properties, resolving the contradiction between temperature performance and reliability.
Solution Approach 2:
The patent uses sulfur as an intermediary that cross-links the conjugated diene polymer chains. This cross-linking action reduces the volatility of the modified asphalt without compromising the low-temperature properties achieved by the polymer modification, thereby preventing cracking and resolving the contradiction between temperature performance and volatility resistance.
3Temperature
If a polymer modifying agent is used to improve physical properties, then low-temperature properties are improved, but viscosity increases reducing workability
Solution Approach 1:
The patent applies parameter changes by controlling the molecular weight of the conjugated diene polymer within 70,000-500,000 g/mol and optimizing the sulfur content at 0.01-5 parts by weight per 100 parts of polymer. This parameter optimization achieves improved low-temperature properties while minimizing viscosity increase, thereby maintaining workability and resolving the contradiction between temperature performance and ease of operation.
4Temperature
If the molecular weight of polymer is increased to improve physical properties, then low-temperature properties are improved, but mixing properties deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight of the conjugated diene polymer to be within 70,000-500,000 g/mol and optimizing sulfur content at 0.01-5 parts by weight per 100 parts of polymer. This parameter control improves low-temperature properties while maintaining adequate mixing properties, resolving the contradiction between temperature performance and ease of manufacture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The asphalt composition significantly enhances low-temperature properties, post-aging properties, and storage stability, maintaining balance between high- and low-temperature performance while improving workability and solubility.
Implementation Method 1
the LCDR is cross-linked by sulfur to enhance dispersion and stability
Data Source
AI summary
Disclosed are an asphalt modifying agent and an asphalt composition containing the same. More specifically, disclosed are an asphalt modifying agent comprising a vinyl aromatic hydrocarbon-conjugated diene block copolymer and a low-molecular weight conjugated diene rubber (LCDR), and an asphalt composition containing the same. Advantageously, the present invention provides an asphalt modifying agent for greatly improving low-temperature properties and modification workability of a modified asphalt and an asphalt composition containing the same.